基于差分GPS的滑坡监测技术研究

发布时间：2018-03-14 20:01

本文选题：差分GPS　切入点：滑坡监测系统　出处：《南京理工大学》2014年硕士论文　论文类型：学位论文

【摘要】：在滑坡监测系统的研究领域中,由于差分GPS技术的发展,使得GPS的定位精度相比其它方法更胜一筹,具有广泛的应用前景,从而成为滑坡监测技术研究的热点。本文主要研究了基于差分GPS的滑坡监测技术,论文的主要研究内容和研究成果如下所示： (1)提出本文的滑坡监测系统是基于差分GPS算法建立的,并分析并整理了GPS定位中的误差来源。主要对滑坡监测系统中的GPS卫星瞬时坐标计算进行了算法分析与程序实现,与精密星历提供的精密坐标进行对比,评价坐标解算的精度。并对各坐标系的相互转换、单点定位等问题进行理论分析与实验论证,进行精度分析。 (2)对差分算法中精度最高的载波相位差分算法的观测模型及其差分改正数生成的过程进行理论研究,并对载波相位差分算法中最关键的整周模糊度的计算方法进行了研究。 (3)确定了滑坡监测系统的组成与硬件设备并进行实验分析,对监测数据进行处理得到载波相位差分曲线随历元间隔不同的变化,以此可以确定整周模糊度解算的历元间隔的范围,并利用确定模糊度之后的载波相位差分曲线进行误差分析。 (4)进行载波相位差分实验时,分析了不同的卫星选择对于载波相位差分基线解算结果的影响。在选星问题上提出选择的卫星之间必须有一定的高度角差值,且单颗卫星的高度角在整个观测时间内不能出现持续快速的变化,这都会影响基线解算的精度,在监测过程中一旦出现卫星失锁必须重新解算模糊度。
[Abstract]:In the research field of landslide monitoring system, because of the development of differential GPS technology, the positioning accuracy of GPS is better than that of other methods. In this paper, the landslide monitoring technology based on differential GPS is mainly studied. The main research contents and research results are as follows:. 1) it is proposed that the landslide monitoring system in this paper is based on the differential GPS algorithm, and the error sources in the GPS positioning are analyzed and sorted out. The calculation of the instantaneous coordinates of the GPS satellite in the landslide monitoring system is mainly analyzed and programmed. Compared with the precise coordinates provided by the precise ephemeris, the precision of coordinate solution is evaluated, and the theoretical analysis and experimental demonstration of the problems of coordinate system transformation and single point positioning are carried out, and the accuracy analysis is carried out. In this paper, the observation model of carrier phase difference algorithm with the highest precision and the process of generating differential correction are studied theoretically, and the calculation method of integer ambiguity, which is the most important part of carrier phase difference algorithm, is studied. The composition and hardware equipment of the landslide monitoring system are determined and the experimental analysis is carried out. The carrier phase difference curve is obtained by processing the monitoring data, and the variation of the carrier phase difference curve with the interval of each epoch is obtained. In this way, the range of epoch interval of integer ambiguity resolution can be determined, and the error analysis is carried out by using carrier phase difference curve after ambiguity determination. In the experiment of carrier phase difference, the influence of different satellite selection on the results of baseline solution of carrier phase difference is analyzed. In the problem of star selection, there must be a certain height angle difference between the selected satellites. Moreover, the altitude angle of a single satellite cannot change continuously and rapidly in the whole observation time, which will affect the accuracy of the baseline calculation. Once the satellite loses its lock in the monitoring process, the ambiguity must be solved again.
【学位授予单位】：南京理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：P228.4;P642.22

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